Hydroids (Cnidaria, Hydrozoa) from Mauritanian Coral Mounds Author Gil, Marta Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & Instituto Español de Oceanografía, Centro Oceanográfico de Vigo. Subida Radio Faro 50. 36390 Vigo. Spain. Author Ramil, Fran Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & framil @ uvigo. es Author Agís, José Ansín Departamento de Ecoloxía e Bioloxía Animal, Facultade de Ciencias do Mar e Centro de Investigación Mariña (CIM-UVigo), Universidade de Vigo. Campus Lagoas-Marcosende. 36310 Vigo. Spain. & ansinjose @ gmail. com text Zootaxa 2020 2020-11-16 4878 3 412 466 journal article 7931 10.11646/zootaxa.4878.3.2 288c6fc9-269b-468f-8811-d79d4350f6e4 1175-5326 4425132 4F59F5B2-CFDB-4819-AF83-0EF232328F8D Clytia paulensis ( Vanhöffen, 1910 ) Clytia paulensis : Ramil & Vervoort, 1992: 239 , fig. 67C–D; Cornelius, 1995b: 258–260 , fig. 59; Medel & Vervoort, 2000: 39–41 ; Vervoort, 2006: 271–272 ; Galea, 2007: 89–90 ; fig. 20J–L. Material examined. MSM 16 /3, stn GeoB 14908–1, ROV, 17°40.213’– 17°40.191’N , 16°40.829’– 16°40.289’W , 463–574 m , 16-XI-2010 : two colonies, one of them attached to Acesta excavata ; no gonothecae . Biology. This species is usually found growing on hydroids and on algae and other invertebrates ( Peña Cantero & García Carrascosa 2002 ; Vervoort 2006 ; Galea 2007 ). Fertile material has been found from April to August ( Peña Cantero & García Carrascosa 2002 ). In our material, one colony was growing on the bivalve A. excavata . Distribution. Clytia paulensis is a circumglobal species widely distributed in the East Atlantic, from England to South Africa ( Medel & Vervoort 2000 ; Galea 2007 ). In West Africa, it was collected from Morocco ( Ramil & Vervoort 1992 ), Canary Islands ( Medel &Vervoort 2000 ; Vervoort 2006 ), Cape Verde ( Medel & Vervoort 2000 ) and Guinea-Bissau ( Gili et al. 1989 ). Its bathymetric range stretches from 0 to 422 m (Ramil 1988; Gil & Ramil 2017a ). Our material was collected from depths of 463 to 574 m , increasing its bathymetric range down to 574 m . Remarks. The small hydrothecae and bidentate cups on the hydrothecal border are diagnostic features for the identification of this species.